Fix the branch that docsy uses for editing and display links

Resolves issue #16

Author: Symbolics

config.toml

@@ -126,6 +126,8 @@ github_repo = "https://github.com/Lisp-Stat/documentation"
 # Specify a value here if your content directory is not in your repo's root directory
 # github_subdir = ""
 
+github_branch = "master"
+
 # Google Custom Search Engine ID. Remove or comment out to disable search.
 #gcs_engine_id = "011737558837375720776:fsdu1nryfng"